Instruction Manual

Operators Instructions for
Unistream Centrifugal Pumps
Manual No/Rev
W21-002E / 10
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 23 of 24
10. Standard Metric Nut and Bolt Torque Recommendations
This information is for reference only. The user must check that the torque figures listed
here are applicable to the fasteners used. Nuts and bolts should be neither under nor over
tightened.
Grade of
Bolt
Approximate Torque (Nm) for Bolt Diameters:
M5 M6 M8 M10 M12 M16 M20 M24 M30 M36
4.6
2.7 4.5 11 22 38 95 185 320 633 1110
8.8
6.9 11.7 28 56 98 244 476 822 1634 2855
10.9
9.4 15.9 38 77 134 332 646 1120 2223 3885
12.9
11.2 19.1 46.4 92 160 397 775 1342 2666 4660
Note: These torque figures are approximate, and for unplated fasteners only. No
allowance has been made for special finishes or lubricants, washers or mating surfaces.
Bolt and Nut Grade Combinations
Grade of BOLT
46 8.8 10.9 12.9 Note: It is permissible to fit higher
grade nuts than recommended.
Grade of NUT
4 8 12 12
10.1 Grade Identification
M
1
0
.
9
Nut & Bolt Grade Identification
High Srength Friction Grip Bolts & Nuts
Bolts & Nuts - Grade 4.6
BS4190 (ISO272, 885, 888 & 4759/1) - Grade marking is optional.
Normally there will no other mark other than the ’M’ thus
Bolts - Grade 8.8
B 3692 (ISO272 & 4759/1) -
Grade marking is mandatory,
also may have trade marks.
S
Nuts - Grade 8
Indented marks as clock face,
dot at 12.00, bar at 8.00
indicates grade of nut.
Bolt
Nut
Bolt
Grade
10.9
Nut
Grade
12
M
M M
M
12
M
8
.
8
Maintenance Record
Date Summary of maintenance & repairs done - replacement parts fitted etc:
Installed & Commissioned
First Oil Change (after 200 hours running)